#ifndef CIR_H
#define CIR_H

namespace cir {
    double PI = 3.1415926;
    //获取圆形周长
    double getLengthOfCircle(double radius){
        return 2 * PI * radius;
    }
    //获取圆形面积
    double getAifCircle(double radius){
        return PI * radius*radius;
    }
}

#endif // CIR_H
